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21458 Susank (1998 HN51)
Classification: Main-belt Asteroid          SPK-ID: 2021458
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06594172104991705 2.8262e-08  
a 2.329310273901771 7.0727e-09 au
q 2.175711545581434 6.5787e-08 au
i 4.637212837246757 3.5198e-06 deg
node 173.7035170068629 3.8596e-05 deg
peri 285.7381219569248 4.8236e-05 deg
M 245.0639946866282 3.0258e-05 deg
tp 2459615.065386276156
(2022-Feb-04.56538628)
0.00010982 TDB
period 1298.492484165472
3.56
5.9141e-06
1.619e-08
d
yr
n .2772445773772563 1.2627e-09 deg/d
Q 2.482909002222108 7.539e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1867  
   data-arc span      10269 days (28.11 yr)  
   first obs. used      1992-09-23  
   last obs. used      2020-11-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50719  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:45:52  

Additional Information
 Earth MOID = 1.1978 au 
 Jupiter MOID = 2.59572 au 
 T_jup = 3.565 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.89   n/a E2020-QM5  
diameter diameter 3.238 km 0.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.28757 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.222   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21458 Susank           Discovered 1998 Apr. 25 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Susan D. Benecchi (née Kern; b. 1977) is currently a postdoctoral researcher at the Space Telescope Science Institute, Baltimore. She specializes in binary transneptunian objects and has a strong interest in science education.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1998 HN51 = 1999 RK36 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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